How are Earth's continents related?
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Answer:

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Explanation:

You know:

CaCO₃ → CaO + CO₂

In the first place, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) the following quantities react and are produced:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by stoichiometry of the reaction, the following mass amounts of the compounds participating in the reaction react and are produced:

You can then apply the following rule of three: if by stoichiometry of the reaction 100 grams of calcium carbonate CaCO₃ produce 56 grams of calcium oxide CaO, 25 grams of CaCO₃ how much mass of CaO will it produce?

\(mass of calcium oxide=\frac{25 grams of CaCO_{3} *56 grams of CaO}{100 grams of CaCO_{3} }\)

mass of calcium oxide= 14 grams

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Complete the oxonium ion, we need to add one hydrogen atom, one electron pair, and one formal charge. We do this by adding a hydrogen atom to the oxygen atom, adding an electron pair to the oxygen atom, and calculating the formal charge of the oxonium ion.

To complete the oxonium ion, we need to add one hydrogen atom, one electron pair, and one formal charge. The first thing to note is that the oxonium ion is a type of ion that is formed when a water molecule gains a hydrogen ion (H+). The H+ ion is then attached to the oxygen atom in the water molecule, creating a positively charged ion.

Now, to add the hydrogen atom, electron pair, and formal charge, we need to look at the structure of the water molecule. Water is made up of two hydrogen atoms and one oxygen atom. The oxygen atom has two lone pairs of electrons and two covalent bonds with the hydrogen atoms.

To complete the oxonium ion, we need to add a hydrogen atom to the oxygen atom. This will create a third covalent bond between the oxygen and hydrogen atoms. The oxygen atom will now have a full octet of electrons, as it will have two lone pairs of electrons and two covalent bonds with the hydrogen atoms.

Next, we need to add an electron pair to the oxygen atom. This is because the oxygen atom will have a positive charge after gaining the hydrogen atom. A positive charge means that the oxygen atom has lost an electron, and it now needs another electron to balance out the charge. The extra electron will come from another molecule or ion that has a negative charge.

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Answer:

a

Explanation:

because it works for radiations

The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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The chemical composition of bullets and handwriting analysis lack scientific validity and reliability.

The chemical composition of bullets and handwriting analysis have been widely criticized as questionable forensic evidence for several reasons.

Firstly, the chemical composition of bullets is often used to link a specific bullet to a particular firearm. However, this technique lacks scientific validity and reliability.

The composition of bullets can vary due to manufacturing variations, environmental factors, and the presence of contaminants. As a result, it is difficult to establish a unique match between a bullet and a specific firearm based solely on chemical analysis.

Secondly, handwriting analysis, also known as handwriting comparison or graphology, is subjective and lacks scientific rigor. It relies on the examiner's subjective interpretation and personal judgment, which can introduce bias and inaccuracies.

The methods used in handwriting analysis have not been standardized or subjected to rigorous scientific testing. Studies have shown that different experts can reach different conclusions when examining the same handwriting sample, making it an unreliable technique for identifying individuals.

Overall, the lack of scientific validity, standardization, and reliability undermines the credibility of these techniques as forensic evidence in court. Their subjective nature and potential for error raise concerns about their accuracy and the risk of wrongful convictions based on such evidence.

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2.497 grams of CuSO4⋅5H2O are needed to prepare 100 mL of a 0.10 M solution.

The term molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.

We need your target solution to have a molarity of 0.10 M and a volume of 100. mL. Therefore,molarity is defined as moles of solute per liter of solution, you can say that the target solution must contain.

Now, calculate the hydrate's percent composition by using its molar mass and the molar mass of anhydrous copper(II) sulfate.

= 159.61g mol−1(159.61+5×18.015)g mol−1×100

= 63.92% CuSO4

This tells you that for every 100 g of copper(II) sulfate pentahydrate, you get 63.92 g of anhydrous copper(II) sulfate. Use this as a conversion factor to get

= 1.596g CuSO4⋅100 g × CuSO4⋅5H2O / 63.92g CuSO4

= 2.497 g CuSO4⋅5H2O

Thus, 2.497 grams of CuSO4⋅5H2O are needed to prepare 100 mL of a 0.10 M solution.

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Answer:

- Anode: Co3+ | Co2+

- Cathode: Ni | Ni2+

Explanation:

The anode is where oxidation reaction occurs, and the cathode is where reduction reaction occurs.

From the table of reduction potencials, we find that:

- Co reaction:

- Ni reaction:

Now, to find out which one is the anode and which one is the cathode, it is necessary to compare the reduction potencials.

The reaction of Ni have negative potentials, so Ni will be the anode and Co will be the cathode.

One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24Mg compared with 12C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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We can use the following formula to get the aqueous solution's molarity (M):

Molarity (M) is calculated as moles of solute per litre of solution.

Given:

KCI dissolution rate (moles) = 3.5 mol

Volume of solution: 0.250 L = 250.0 mL * (1 L / 1000 mL)

Let's determine the molarity now:

Molarity (M) = 3.5 mol/0.250 litre

Molarity (M) equals 14 mol/L.

We can express the solution as 14.0 M because the molarity is 14 mol/L.

To guarantee that the volume is in litres (L), it is crucial to use the appropriate unit conversion. The stated quantities have two significant figures (3.5 and 0.250), hence the answer is 14.0 M as well.

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Answer:

2 C7H6O2 + 15 O2 --> 14 CO2 + 6 H2O

Explanation:

Answer: The different quantities of eggs are: grade aa, grade a and grade b. The different quantities of an egg are: hard & soft boiled, hard & soft scrambled, sunny side up and over easy-over hard.

Explanation: hope it helps

There won't be any reaction when zinc powder is introduced to a magnesium chloride aqueous solution. Therefore, choice A is the best option.

A more reactive element displacing a less reactive element from its salt solution is known as a single replacement reaction. As a result, one element ought to be distinct from another. The general form of this reaction is given by XY+Z→XZ+Y.

Magnesium will only be replaced if it reacts with species that are more reactive than it; otherwise, it won't. Zinc is less reactive than magnesium because it comes after magnesium in the electrochemical series.

Mg has a reduction potential of (-2.37) and Zn has a reduction potential of (-0.76). Therefore, since zinc is less reactive than magnesium and cannot replace magnesium, no reaction will take place when zinc dust is added to MgCl₂. Therefore, the suitable option is A.

The complete question is -

Consider the following standard electrode potentials.

Zn²⁺ (aq) + 2e⁻ → Zn(s) E₀ = –0.76 V

Cl₂ (g) + 2e⁻ → 2Cl⁻ (aq) E₀ = +1.36 V

Mg²⁺ (aq) + 2e⁻ → Mg(s) E₀ = –2.37 V

What will happen when zinc powder is added to an aqueous solution of magnesium chloride? A. No reaction will take place. B. Chlorine gas will be produced. C. Magnesium metal will form. D. Zinc chloride will form. Justify your answer.

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The value of the volume of hydrogen gas produced is 4.5 L.

We can calculate the moles of hydrogen gas produced by using the balanced chemical equation of the reaction.

Sodium + Water → Sodium hydroxide + Hydrogen gas2Na + 2H₂O → 2NaOH + H₂

Molar mass of Na = 23 g/mol

Moles of Na = Mass/Molar mass = 4.78/23 = 0.208 moles

From the above equation, it is evident that 1 mole of sodium produces 1 mole of hydrogen gas.

Therefore, moles of hydrogen gas produced = moles of Na = 0.208 moles

Now, we can use the ideal gas law to calculate the volume of hydrogen gas produced.

PV = nRTV = nRT/P

Where;

R = 8.31 J/K mol

P = 88.9 kPa = 88.9 × 1000 Pa

T = 307 K

N = 0.208 mol

Volume,

V = 0.208 × 8.31 × 307 / (88.9 × 1000)

V = 0.0045 m³ or 4.5 L (rounded to one decimal place)

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The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

Answer:

what's the question?

Explanation:

for real though what's the question?

Answer: C

Explanation: Because gas particles are free to move fast where as liquid can move a little but solid cant so it would be C

Hope it helps

Answer:

a

Explanation:

the traits of the organism

The third quantum number of a 2s² electron in phosphorus, m = 0.

The correct option is D.

Quantum numbers are the set of numbers used to express the location and energy of an electron in an atom.

There are four types of quantum numbers;

The electronic configuration of phosphorus is 1s²2s²2p63s²3p³.

The third quantum number m has values of -l to +l.

For phosphorus, l is 0. Hence, m is also 0.

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Answer:

41.88375 g Fe

Explanation:

Using stoichiometry, we can do this problem. First, we put our given. Then we create an equation using the molar mass of Fe (found on the periodic table, which was 55.845 g Fe), and the resulting equation is:

\(0.75 mol Fe * \frac{55.845 g Fe}{1 mol Fe}\)

The mol Fe's cancel, and leave us with:

41.88375 g Fe

Good luck.

The best method for extracting the mixture's components would be choice b.

To separate a mixture of MeOH, CH3CHO, and CH3CHOH by extraction, we can use the difference in their acid-base properties. MeOH and CH3CHO are neutral molecules, while CH3CHOH can act as a weak acid and donate a proton to a base. Therefore, we can selectively extract CH3CHOH using a basic aqueous solution.

Option a suggests using NaOH(aq) to extract the mixture, which would convert CH3CHOH to its conjugate base CH3CHO^- and make it more water-soluble. However, this may also deprotonate MeOH and make it more water-soluble, reducing the efficiency of the extraction.

Option b suggests using NaHCO3(aq) as the extracting solution, which would selectively extract CH3CHOH without affecting MeOH or CH3CHO. The resulting CH3CHOH-NaHCO3 salt can be converted back to CH3CHOH by adding an acidic solution.

Option c suggests using HCl(aq) to extract the mixture, which would protonate CH3CHOH to form CH3CHOH2+ and make it more water-soluble. This may also protonate MeOH and CH3CHO, reducing the efficiency of the extraction.

Overall, option b would be the most effective way to separate the mixture by extraction.

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The final electron acceptor in aerobic respiration is oxygen (O2).The electron transport chain (ETC) in cellular respiration relies on a final electron acceptor to help oxygen get reduced into water. This is why oxygen is considered the final electron acceptor in cellular respiration.

During cellular respiration, glucose is broken down into pyruvate. Pyruvate is then transformed into acetyl CoA and enters the citric acid cycle, where it is oxidized and generates ATP, NADH, and FADH2. The final stage of aerobic respiration involves the electron transport chain, in which electrons from NADH and FADH2 are passed through a series of proteins and coenzymes in the inner mitochondrial membrane, ultimately reducing oxygen to form water.

This process is known as oxidative phosphorylation.In conclusion, the final electron acceptor in aerobic respiration is oxygen (O2), and carbon dioxide is generated in the link reaction (pyruvate oxidation) and the citric acid cycle.

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